Xfinity is blocking my Internet service which is paid through my rent regarding an unresolved cable bill

I have lived in my apartment building for over 10 years. When I came here, there was no bulk service requirement that we pay $50/month for Xfinity Internet and no one else. Now there is that requirement. Because of issues with my cable bill which has been canceled, Xfinity is denying me Internet access and worse yet is not offering me any means to resolve this. How is it fair to deny service for something paid over an unrelated service? Can someone help? If it were up to me, I would not use any Xfinity products and I had been a customer off and on for nearly 20 years. I actually like the product itself but dealing with Xfinity is nightmarish and prices change arbitrarily. My bill on the cable side just kept going up and up. But again I am forced to pay for my Internet through my rent and it is fully paid up but I am being denied Internet service.